Speaker
Prof.
Charles Reichhardt
Description
We examine the properties of systems of particles which have
competing repulsive and attractive interactions as a
function of density and temperature. Such interactions can
arise in type-1.5 superconductors, magnetic superconductors,
stripes in 2D electron gas systems, high temperature
superconductors, colloidal particles, and even dense nuclear
matter. For systems with long range repulsion and short
range attraction as a function of increasing density, we
find transitions between a low density clump phase, an
intermediate stripe phase, an anticlump phase, and a high
density uniform phase. These phases can exhibit a multistep
melting process in which a state appears which has
liquidlike structure at short length scales but at long
length scales the solidlike stripe or clump stuctures remain
intact. At higher temperatures the larger scale structures
also melt. We examine the effects of quenched disorder on
these systems and find isotropic and anisotropic responses
under an applied drive. I will also show results for
systems of vortex matter with competing interactions and
will discuss the static and dynamic phases that occur in
this system with and without a pinning substrate.
Primary author
Prof.
Charles Reichhardt
